Playback method and playback device

Abstract

A playback method according to one aspect of the present disclosure is performed by a Blu-ray device connected to a display device. The playback method includes obtaining, from a recording medium, output control information of content recorded on the recording medium; obtaining, from the recording medium, a video signal of the content recorded on the recording medium; and (a) outputting the obtained video signal to the display device without converting image quality of the video signal, when the obtained output control information does not restrict output of content using a first copyright protection technology, and (b) converting the image quality of the obtained video signal and outputting the video signal to the display device, when the obtained output control information restricts output of content using the first copyright protection technology and output using the first copyright protection technology is performed according to a type of the display device.

What is claimed is: 
     
       1. A playback method performed by a playback device that plays content, the playback method comprising:
 obtaining a type of a display device connected to the playback device;
 obtaining, from a recording medium, output control information of the content recorded on the recording medium; 
 obtaining, from the recording medium, a video signal of the content recorded on the recording medium; and 
 
 outputting the obtained video signal to the display device;
 wherein the playback device includes storage that stores: a first table defining one or more copyright protection technologies included in a first copyright protection technology; and a second table defining one or more copyright protection technologies included in a second copyright protection technology, the second copyright protection technology being more enhanced than the first copyright protection technology, 
 wherein in the obtaining of the output control information, an output flag indicating rules about use of the first table and the second table is obtained, and whether to use the first copyright protection technology or use the second copyright protection technology is determined, and 
 wherein in the outputting,
 when the obtained video signal is output to the display device using the first copyright protection technology, the copyright protection technologies defined in the first table are used, and 
 when the obtained video signal is output to the display device using the second copyright protection technology, the copyright protection technologies defined in the second table are used. 
 
 
 
     
     
       2. The playback method according to  claim 1 ,
 wherein the copyright protection technologies defined in the first table include HDCP (High-bandwidth Digital Content Protection) 1.4, and 
 wherein the copyright protection technologies defined in the second table include HDCP 2.2. or a later version. 
 
     
     
       3. The playback method according to  claim 1 ,
 wherein the obtained video signal is a video signal with a second resolution having a larger number of pixels than that of a first resolution, or a video signal with a second luminance range including a first luminance range and having a higher peak luminance than that of the first luminance range, and 
 wherein in the outputting,
 (a) when the obtained output flag is a first flag indicating that output of content using the first copyright protection technology is not restricted, the obtained video signal is output to the display device without converting the image quality of the video signal, using either one of the first copyright protection technology and the second copyright protection technology, 
 (b) when the obtained output flag is a second flag indicating that output of content using the first copyright protection technology is restricted, (i) the obtained video signal is converted to a video signal with the first resolution and the first luminance range, and the converted video signal is output to the display device using the first copyright protection technology, or (ii) the obtained video signal is output to the display device using the second copyright protection technology, and 
 (c) when the obtained output flag is a third flag indicating that output of content using the first copyright protection technology is not allowed, the obtained video signal is output to the display device using the second copyright protection technology. 
 
 
     
     
       4. The playback method according to  claim 3 , wherein in the outputting, when the display device does not support the second copyright protection technology,
 (a) when the obtained output flag is the first flag, the obtained video signal is output to the display device using the first copyright protection technology, 
 (b) when the obtained output flag is the second flag, the conversion is performed on the obtained video signal to reduce the image quality, and the converted video signal is output to the display device using the first copyright protection technology, and 
 (c) when the obtained output flag is the third flag, output of the obtained video signal is inhibited. 
 
     
     
       5. The playback method according to  claim 1 ,
 wherein the obtained video signal is a video signal with a second resolution having a larger number of pixels than that of a first resolution, or a video signal with a second luminance range including a first luminance range and having a higher peak luminance than that of the first luminance range, and 
 wherein in the outputting,
 (a) when the obtained output flag is a first flag indicating that output of content using the first copyright protection technology is not restricted, the obtained video signal is output to the display device without converting the image quality of the video signal, using either one of the first copyright protection technology and the second copyright protection technology, and 
 (b) when the obtained output flag is a second flag indicating that output of content using the first copyright protection technology is restricted, (i) the obtained video signal is converted to a video signal with the first resolution and the first luminance range, and the converted video signal is output to the display device using the first copyright protection technology, or (ii) the obtained video signal is output to the display device using the second copyright protection technology. 
 
 
     
     
       6. The playback method according to  claim 5 , wherein in the outputting, when the display device does not support the second copyright protection technology,
 (a) when the obtained output flag is the first flag, the obtained video signal is output to the display device using the first copyright protection technology, and 
 (b) when the obtained output flag is the second flag, the conversion is performed on the obtained video signal to reduce the image quality, and the converted video signal is output to the display device using the first copyright protection technology. 
 
     
     
       7. A playback device that plays content, the playback device comprising:
 circuitry that, in operation, performs operations including:
 obtaining a type of a display device connected to the playback device; 
 obtaining, from a recording medium, output control information of the content recorded on the recording medium; 
 obtaining, from the recording medium, a video signal of the content recorded on the recording medium; and 
 
 outputting the obtained video signal to the display device; and 
 storage that stores: a first table defining one or more copyright protection technologies included in a first copyright protection technology; and a second table defining one or more copyright protection technologies included in a second copyright protection technology, the second copyright protection technology being more enhanced than the first copyright protection technology,
 wherein the circuitry, in operation, further performs operations including obtaining an output flag indicating rules about use of the first table and the second table, and determining whether to use the first copyright protection technology or to use the second copyright protection technology, and 
 wherein,
 when the obtained video signal is output to the display device using the first copyright protection technology, the copyright protection technologies defined in the first table are used, and 
 when the obtained video signal is output to the display device using the second copyright protection technology, the copyright protection technologies defined in the second table are used. 
 
 
 
     
     
       8. A playback device that plays content, the playback device comprising:
 circuitry that, in operation, performs operations including:
 obtaining a type of a display device connected to the playback device; 
 obtaining, from a recording medium, output control information of the content recorded on the recording medium; 
 obtaining, from the recording medium, a video signal of the content recorded on the recording medium; and outputting the obtained video signal to the display device; and 
 
 storage that stores: a first table defining one or more copyright protection technologies included in the first copyright protection technology; and a second table defining one or more copyright protection technologies included in a second copyright protection technology, the second copyright protection technology being more enhanced than the first copyright protection technology, 
 wherein the circuitry, in operation, further performs operations including obtaining an output flag indicating rules about use of the first table and the second table, and determining whether to use the first copyright protection technology or to use the second copyright protection technology, according to the obtained type of the display device, 
 wherein the video signal obtained by the circuitry is a video signal with a second resolution having a larger number of pixels than that of a first resolution, or a video signal with a second luminance range including a first luminance range and having a higher peak luminance than that of the first luminance range, and 
 wherein the circuitry, in operation, further performs operations including 
 (a) outputting the obtained video signal to the display device without converting the image quality of the video signal, using either one of the first copyright protection technology and the second copyright protection technology, when the obtained output flag is a first flag indicating that output of content using the first copyright protection technology is not restricted; and 
 (b) (i) converting the obtained video signal to a video signal with the first resolution and the first luminance range, and outputting the converted video signal to the display device using the first copyright protection technology, or (ii) outputting the obtained video signal to the display device using the second copyright protection technology, when the obtained output flag is a second flag indicating that output of content using the first copyright protection technology is restricted.